Another wonderful day exploring and hunting the wild solanums of Argentina! Some might think we were a bit crazy – but not as crazy as the chaps we met up in the puna near the dunes a couple of days ago (forgot to write about them) who were traversing Argentina on motorbikes from Tierra del Fuego to the Bolivian border – 5000 km each way!! - in 15 days; this definitely makes botanists look sane.
Today we went to a small mountain range in the eastern part of the province of Jujuy – specifically to look for a plant known only from its type specimen (Solanum fabrisii), to see if we could recollect it. We did – it turns out to be the same (we think) as a species someone described earlier (Solanum glandulosipilosum – great name); this makes it a synonym – not a mistake, but a different interpretation of the evidence to hand (a story for another time!). On the way – we saw spectacular scenery, this huge canyon had no roads or trails leading to it – tierra incognita – or so it seemed to us.
Today has made us both think about why field work is so important for the science we do at the Museum; not only do we find new things and sort out who is who, but field work is essential for looking at the natural variation of plants in the wild. Take, for example, a species we saw all day today – Solanum “aloysiifolium” (in quotes because we are not quite sure what its correct name is yet!). We saw this plant all over the Sierra de Santa Barbara (and have before today), but each time it looks a little bit different – just like individual people look different in small details. Big leaves, small leaves; white flowers, purplish flowers….. This is variation – the very stuff of evolution. Seeing this species in many different places, and looking a little bit different every time lets us calibrate how we are defining species, and shows just how much variation there is in nature. Doing this together, all three of us can discuss what matters, what we see (and we all do see very different things!) and just how we might deal with the complexity of what we observe. Collecting specimens that we will later look at carefully in the herbarium will let us connect the differences we see in the field with the data we take from pressed specimens and from DNA sequences to come to decision about what constitutes this particular species – is this one species or three or seven?
Collecting a species more than once is definitely NOT a waste of time! It does, however, mean we have more plants to dry every night on Gloria’s field dryer – here set up in our hotel in the town of Libertador General San Martín; we set it up every night and it works a treat. Looking for electric sockets in tiny hotels in villages in out of the way places can be a challenge though…..